<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    
    <view class="scroll-view-container">
      <!-- 左侧 -->
      <scroll-view scroll-y="true" class="left-scroll-view" :style="{height: wh + 'px'}">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i===active? 'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>        
        
      </scroll-view>
      <!-- 右侧 -->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        
     <view class="cate-lv2" v-for="(item2, i2) in cateLever2" :key="i2">
       <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
       <!-- 当前二级分类下的三级分类列表 -->
       <view class="cate-lv3-list">
         <!-- 三级分类item项 -->
         <view class="cate-lv3-item" v-for="(item3 ,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
           <!-- 三级分类的图片 -->
           <image :src="item3.cat_icon" mode=""></image>
           <!-- 三级分类的文字 -->
           <text>{{item3.cat_name}}</text>
         </view>
       </view>
     </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from "@/mixins/tabbar-badge.js"
  export default {
      mixins: [badgeMix],
    data() {
      return {
        wh:0,
        cateList:[],
        
        active: 0,
        // 二级分类
        cateLever2:[],
        scrollTop:0
      };
    },
    methods:{
         gotoSearch() {
           uni.navigateTo({
             url: '/subpkg/search/search'
           })
         },
      async getCateList(){
        const {data:res}= await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !=200) return uni.$showMsg()
        this.cateList = res.message
        
        this.cateLever2=res.message[0].children
      },
      activeChanged(i){
        this.active = i
        // 重新赋值
        this.cateLever2=this.cateList[i].children
        
        this.scrollTop= this.scrollTop === 0? 1: 0
      },
      // 跳转列表页面
      gotoGoodsList(item){
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      }
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh=sysInfo.windowHeight -50
      this.getCateList()
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  
  .left-scroll-view{
    width: 120px;
    
    .left-scroll-view-item{
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active{
        background-color: #FFFFFF;
        position:relative;
        
        &::before {
          content:' ';
          display: block;  
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
}

.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item{
    width: 33.33%;
    display: flex;
    margin-bottom: 10px;
    flex-direction: column;
    align-items: center;
    
    image{
      width: 60px;
      height: 80px;
    }
    text{
      font-size: 12px;
    }
    
  }
}
</style>
